#include <OneButton.h>
#include <RotaryEncoder.h>
#include <Adafruit_NeoPixel.h>

RotaryEncoder encoder(A3, A2, RotaryEncoder::LatchMode::TWO03);

int pin = 3;
int numPixels = 16; // Popular NeoPixel ring size
#define MAX_SLIDE_POT_ANALOG_READ_VALUE 1024

int mode;
const int modes = 4;
int analogSliderValues[modes];
bool Muted[modes] = {false, false, false, false};
const int Mute = 0;
static int pos = 250;
int newPos = 250;
static int pos1 = 250;
int newPos1 = 250;
static int pos2 = 250;
int newPos2 = 250;
static int pos3 = 250;
int newPos3 = 250;
OneButton button(9, true);
byte setPos = 0;

int pixelFormat = NEO_GRB + NEO_KHZ800;
Adafruit_NeoPixel *pixels;

void setup() {
  button.attachClick(singleclick);                  // Link the function to be called on a single click event.
  button.attachLongPressStop(longclick);
  Serial.begin(9600);

  // Enable Pin Change Interrupt 1 that covers the Analog input pins or Port C.
  PCICR |= (1 << PCIE1);                      
  PCMSK1 |= (1 << PCINT10) | (1 << PCINT11);

  pixels = new Adafruit_NeoPixel(numPixels, pin, pixelFormat);
  pixels->begin();
  pixels->setBrightness(30);  // Set brightness to a low value.
}  // setup()

ISR(PCINT1_vect) {
  encoder.tick();  // Just call tick() to check the state.
}  // ISR

void loop() {
  button.tick();

  switch (mode) {
    case 1: Line1(); break;
    case 2: Line2(); break;
    case 3: Line3(); break;
    case 4: Line4(); break;
  }

  switch (mode) {
    case 1: 
      analogSliderValues[0] = !Muted[0] ? newPos : Mute;
      break;
    case 2: 
      analogSliderValues[1] = !Muted[1] ? newPos1 : Mute;
      break;
    case 3: 
      analogSliderValues[2] = !Muted[2] ? newPos2 : Mute;
      break;
    case 4: 
      analogSliderValues[3] = !Muted[3] ? newPos3 : Mute;
      break;
  }
  pixels->show();

  switch (setPos) {
    case 1: updatePixels(pos, 150, 150, 150, Muted[0]); break;
    case 2: updatePixels(pos1, 150, 100, 0, Muted[1]); break;
    case 3: updatePixels(pos2, 0, 0, 150, Muted[2]); break;
    case 4: updatePixels(pos3, 150, 0, 0, Muted[3]); break;
  }

  sendSliderValues();
  printSliderValues();
}  // loop()

void updatePixels(int position, int r, int g, int b, bool muteStatus) {
  int value_pot_a = position;
  int num_leds_switchedon = map(value_pot_a, 0, MAX_SLIDE_POT_ANALOG_READ_VALUE, 0, numPixels - 1);

  for (int i = 0; i < num_leds_switchedon; ++i) {
    pixels->setPixelColor(i, pixels->Color(r, g, b));
  }
  for (int i = num_leds_switchedon; i < numPixels - 1; ++i) {
    pixels->setPixelColor(i, pixels->Color(0, 0, 0));
  }
  pixels->setPixelColor(23, muteStatus ? pixels->Color(255, 0, 0) : pixels->Color(0, 0, 0));
  pixels->show();
}

void Line1() {
  if (setPos != 1) {
    setPos = 1;
    encoder.setPosition(pos);
  }
  newPos = encoder.getPosition();
  if (pos != newPos) {
    pos = newPos;
  }
}  // Line1()

void Line2() {
  if (setPos != 2) {
    setPos = 2;
    encoder.setPosition(pos1);
  }
  newPos1 = encoder.getPosition();
  if (pos1 != newPos1) {
    pos1 = newPos1;
  }
}  // Line2()

void Line3() {
  if (setPos != 3) {
    setPos = 3;
    encoder.setPosition(pos2);
  }
  newPos2 = encoder.getPosition();
  if (pos2 != newPos2) {
    pos2 = newPos2;
  }
}  // Line3()

void Line4() {
  if (setPos != 4) {
    setPos = 4;
    encoder.setPosition(pos3);
  }
  newPos3 = encoder.getPosition();
  if (pos3 != newPos3) {
    pos3 = newPos3;
  }
}  // Line4()

void sendSliderValues() {
  String builtString = String("");
  for (int i = 0; i < mode; i++) {
    builtString += String((int)analogSliderValues[i]);
    if (i < mode - 1) {
      builtString += String("|");
    }
  }
  Serial.println(builtString);
}

void printSliderValues() {
  for (int i = 0; i < modes; i++) {
    String printedString = String("Slider #") + String(i + 1) + String(": ") + String(analogSliderValues[i]) + String(" mV");
    Serial.write(printedString.c_str());
    if (i < modes - 1) {
      Serial.write(" | ");
    } else {
      Serial.write("\n");
    }
  }
}

void singleclick() {  
  mode++;
  if (mode == 5) {
    mode = 1;
  }
}

void longclick() {
  switch (mode) {
    case 1: Muted[0] = !Muted[0]; break;
    case 2: Muted[1] = !Muted[1]; break;
    case 3: Muted[2] = !Muted[2]; break;
    case 4: Muted[3] = !Muted[3]; break;
  }
}